Drilling-machine



(No Model.)

S. ELLIOTT.

DRILLING MACHINE.

Patented Aug. 18, 1885.

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UNITE STERLING ELLIOTT, OF \VATERTOXVN, MASSACHUSETTS.

DRILLING- MACHINE.

Mo m forming part of Letters Patent No. 324,759, dated August 18,1885. Application lilcd-Iuly 7, i884. xi) model.)

To aid whom it may concern.-

Be it known that I, STERLING ELLIOTT, of 'Watertown, county of Middlesex, State of Massachusetts, have invented an Improvement in Drill-Presses, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

This invention has for its object the prod uetion ofa light-running, efficient, and durable drill-press.

In drill-presses as heretofore constructed the wear of the spindle, both in its rotary and longitudinal movements, has been upon the same bearings, which quickly wears the said bearings, and also causes the strain of the driving-belt to interfere with the longitudinal movement of the spindle. In my invention the cone has sleeve-like extensions which enter bearings, and the spindle takes independent bearings in said sleeves.

Figure 1 is a side elevation, partially in section, of a drillpress embodying my invention. Fig. 2 is a sectional detail of the lower end or base of the press, to illustrate the mechanism employed to cause the descent of the drill. Fig. 3 is a detail, partially in section, showing the pin to confine the table-holding arms in place, and Fig. 4 a partial section showing the spring-pin in place in groove 8.

The hollow column A, of any suitable length, has a broad base or foot, A, and at its upper end supports a head, A, provided with bearing supports or arms a a b b. The arms a a are provided with brass or other suitable boxes or bearings, a (L to receive the sleeve-like journal a of the hollow shell-like cone 0, and the like journal a of the head a of the said cone. The upper end of the lower bearing, a, is recessed to receive a rawhide or other washer, and also to form an oil-space in which the said washer rests, the small end of the shelllike cone resting upon the said washer.

The chuck D, of usual construction, and adapted to hold a drill of usual shape, is attached in usual manner to the spindle E, which is extended through the hollow sleeve-like journals a a of the cone. The spindle D has fixed to it the driver d, having arms extended to embrace and slide upon guide-rods d (1,

connected with the said. cone and its head.

Below the driver the spindle D is surround ed by a spiral spring, (2 which, resting at its lower end upon the interior of the cone, acts to support the spindle D and its attached chuck, except when the same is positively depressed to cause the descent of the spindle.

The above chuck has an annulus, 6, connected by pivotscrews c with the forked or yokelike end of a lever, c, pivoted at e on a link, a, pivoted at e on the frame. The inner end of the lever c is connected by a rod, f, with the inner end of a lever, f, pivoted at f", and having a sector-like or enlarged end, f", provided with suitable notches or holes, 2, to be engaged by apin or bolt, 3, of a hand-lever, g, or a pin or bolt, 4, of a foot-lever, h, each, as herein shown, having its fulcrum on the rod f", which holds the lever f f.

The spindle may be forced down by means of either the hand or foot lever, and the connection of each with the sector-like end f" may be adjusted to suit the requirements of the workman or the work being done.

The shaft m, the cone m thereon, and the means for driving it, as well as the bed a and the means for adjusting it, are all substantially as usual, except, it may be, as to then exact arrangement.

The cone C will be driven from the cone m by abelt extended from one to the other, as usual.

The annulus c is kept down upon the top of the chuck D by a collar attached to the spindle in suitable manner. The spring (I has sufficient strength to substantially counterbalance the weight of the spindle and chuck, and the said spring rotates with the spindle, the lower end of the spring resting upon the cone.

The upper end of the spindle is provided with an adjustable stop, 1', made as a clamp, which is made to clasp the spindle by the action of a screw, r. The adjustment of this stop determines the descent of the spindle and drill, and consequently the depth of the hole to be made by the drill or countcrbore. I

The stem of the table a enters a socket at the end of arms at, having a split hub which embraces and is adjustable both vertically and horizontally 0n the column A.

The column A is provided with a vertical groove,'8, which receives the inner end of a pin, 9, (shown as a spring-pin,) the said pin being contained in a casing, 12, screwed to 5 vided with a lug, 14, which, when the pin is retracted against the pressure of the spring surrounding it, and partially turned or rotated, rests against the outer end of the easing and acts to keep the pin drawn back, so that the table can be swung'about the column as may be desired.

In this my invention the spindle E has only a movement of reciprocation in the sl'eeve-like bearings of the cone which revolves with it, and the strain of the driving-belt on the cone 0 does not exert any pressurewhich forces the spindle against its bearings. The power exerted to force the drill into the work is applied directly to the top of the chuck, and by a lever having its fulcrum close to the column, which results in greatly reducing strain on the parts.

I claim 1. In a drill-press, the hollow cone having at its ends hollow sleevelike bearings, combined with a spindle taking its bearings in the said sleeve-like bearings, and means to connect the cone and spindle to revolve in unison, substantially as described.

2. The hollow cone having at its opposite ends hollow sleeve-like bearings and theguiderods, and the spindle taking its bearings in the sleeves of the cone, combined with the driver arranged to slide on the said guide- 3 5 rods, substantially as described.

3. The cone and the spindle therein, and

means to connect them to rotate in unison, combined with a stop attached to the spindle to limit the descent of the spindle, substantially as described.

4.. In afdrill-press, the cone, and the spindle having its bearings in the cone, and means to connect the said spindle and cone to revolve in unison, combined with a spring to elevate the spindle, and with a lever to depress the same, substantially as described.

5. The lever f, having a segmental end,

and the rod f, lever 0 and spindle and chuck, combined with a lever adjustably connected with the segmental head or end ofthe lever f, to operate substantially as described.

6. In a drillpress, the column provided with a longitudinal groove, the table it, and arm n to support it, combined uith a pin adapted to be placed in or to be withdrawn from the said groove, the pin in the groove causing the alignment of the center of the table with the center of the spindle, and when out of the groove permitting the said arm to be rotated on the column, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

STERLING ELLIOTT.

Witnesses:

G. \V. GREGORY, V. H. SIcs'roN. 

